/*
 *
 *
 *   Copyright (c) International Business Machines  Corp., 2001
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * NAME
 *	kill07.c
 *
 * DESCRIPTION
 *	Test case to check that SIGKILL can not be caught.
 *
 * ALGORITHM
 *	call setup
 *		setup some shared memory
 *	loop if the -i option was given
 *	set up to catch SIGKILL
 *	if SIGKILL is caught set the shared memory flag.
 *	fork a child
 *	execute the kill system call
 *	check the return value 
 *	if return value is -1
 *		issue a FAIL message, break remaining tests and cleanup
 *	if we are doing functional testing
 *		if the process was terminated with the expected signal and the 
 *		signal was not caught.
 *			issue a PASS message
 *		otherwise
 *			issue a FAIL message
 *	call cleanup
 *
 * USAGE
 *  kill07 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
 *     where,  -c n : Run n copies concurrently.
 *             -f   : Turn off functionality Testing.
 *             -i n : Execute test n times.
 *             -I x : Execute test for x seconds.
 *             -P x : Pause for x seconds between iterations.
 *             -t   : Turn on syscall timing.
 *
 * HISTORY
 *	07/2001 Ported by Wayne Boyer
 *
 * RESTRICTIONS
 *	This test should be run as a non-root user.
 */

#include "test.h"
#include "usctest.h"

#include <signal.h>
#include <errno.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/wait.h>

void cleanup(void);
void setup(void);
void sighandler(int sig);
void do_child(void);

char *TCID= "kill07";
int TST_TOTAL = 1;
int shmid1;
extern key_t semkey;
int *flag;

extern int Tst_count;
extern int getipckey();
extern void rm_shm(int);

#ifndef UCLINUX

#define TEST_SIG SIGKILL

int main(int ac, char **av)
{
	int lc;			/* loop counter */
	char *msg;		/* message returned from parse_opts */
	pid_t pid;
	int exno, status, nsig, asig, ret;
	struct sigaction my_act, old_act;

	/* parse standard options */
	if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
		tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
	}

#ifdef UCLINUX
	maybe_run_child(&do_child, "");
#endif

	setup();                        /* global setup */

	/* The following loop checks looping state if -i option given */
	for (lc = 0; TEST_LOOPING(lc); lc++) {

		/* reset Tst_count in case we are looping */
		Tst_count = 0;
		status = 1;
		exno = 1;
		my_act.sa_handler = sighandler;
		my_act.sa_flags = SA_RESTART;
		sigemptyset(&my_act.sa_mask);

		if ((shmid1 = shmget(semkey, (int)getpagesize(), \
			 0666|IPC_CREAT)) == -1) {
			tst_brkm(TBROK, cleanup,
				"Failed to setup shared memory");
		}

		if (*(flag = (int *)shmat(shmid1, 0, 0)) == -1) {
			tst_brkm(TBROK, cleanup,
				"Failed to attatch shared memory:%d", *flag);
		}

		*flag = 0;

		/* setup the signal handler */
		ret = sigaction(TEST_SIG, &my_act, &old_act);

		pid = FORK_OR_VFORK();
		if (pid < 0) {
			tst_brkm(TBROK, cleanup, "Fork of child failed");
		} else if (pid == 0) {
#ifdef UCLINUX
			if (self_exec(av[0], "") < 0) {
				tst_brkm(TBROK, cleanup, "self_exec of child failed");
			}
#else
			do_child();
#endif
		} else {
			/* sighandler should not catch this signal */
			/* if it does flag will be set to 1 */
			sleep(1);
			TEST(kill(pid, TEST_SIG));
			waitpid(pid, &status, 0);
		}

		if (TEST_RETURN == -1) {
			tst_brkm(TFAIL, cleanup, "%s failed - errno = %d : %s",
				TCID, TEST_ERRNO, strerror(TEST_ERRNO));
			/*NOTREACHED*/
		}

		if (STD_FUNCTIONAL_TEST) {
			/*
			 * Check to see if the process was terminated with the
			 * expected signal.
			 */
			nsig = WTERMSIG(status);
			asig = WIFSIGNALED(status);
			if ((asig == 0) & (*flag == 1)) {
				tst_resm(TFAIL, "SIGKILL was unexpectedly"
							" caught");
			} else if ((asig == 1) & (nsig == TEST_SIG)) {
				tst_resm(TINFO, "received expected signal %d",
					nsig);
				tst_resm(TPASS,
					"Did not catch signal as expected");
			} else if (nsig) {
				tst_resm(TFAIL,
					"expected signal %d received %d",
					TEST_SIG,nsig);
			} else {
				tst_resm(TFAIL, "No signals received");
			}
		}
		if (shmdt(flag)) {
			tst_brkm(TBROK, cleanup, "shmdt failed ");
				/*NOTREACHED*/
		}
	}
	cleanup();

	/*NOTREACHED*/
	return(0);
}

/*
 * sighandler() - try to catch SIGKILL
 */

void
sighandler(int sig)
{
	/* do nothing */
	*flag = 1;
	return;
}

/*
 * do_child()
 */
void
do_child()
{
	int exno = 1;

	sleep(300);
	/*NOTREACHED*/
	tst_resm(TINFO, "Child never recieved a signal");
	exit(exno);
}

/*
 * setup() - performs all ONE TIME setup for this test
 */
void
setup(void)
{

	/* Pause if that option was specified */
	TEST_PAUSE;
	
	/* get an IPC resource key */
	semkey = getipckey();

}

/*
 * cleanup() - performs all the ONE TIME cleanup for this test at completion
 * or premature exit.
 */
void
cleanup(void)
{
	/*
	 * print timing status if that option was specified.
	 * print errno log if that option was specified
	 */
	TEST_CLEANUP;

  	/*
  	 * remove the shared memory
  	 */
	rm_shm(shmid1);

	/* exit with return code appropriate for results */
	tst_exit();
}

#else

int main()
{
	tst_resm(TINFO, "test is not available on uClinux");
	return 0;
}

#endif 
